Which of the following conclusions can be made if two identical insertion sequences are identified in separate locations on a chromosome?
A. The insertion sequence was transferred via simple transposition.
B. The insertion sequence was a "cut-and-paste" transposon.
C. A mutation occurred during transposition of the insertion sequence.
D. The insertion sequence was transferred via replicative transposition.
Answer: D
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Eukaryotic chromatin can be described in topological terms as a series of:
A. constrained segments. B. constrained loops. C. relaxed linear segments. D. relaxed loops. E. plectonemic supercoils.
Recently, the bones (not fossils) of a possible new species of humans (in the genus Homo) have been found on an island in Indonesia (an island nation southeast of Asia)
Using radiometric dating, scientists can show that these people were alive as recently as 17,000 years ago. According to the information in this chapter, why do you think they probably used tools?
A nucleic acid contains uracil, allowing you to conclude that:
A. this nucleic acid could be either DNA or RNA. B. this nucleic acid is RNA. C. this nucleic acid is DNA.
Fats composed of fatty acids that have double bonds in the fatty acids and have fewer than the maximum number of hydrogen atoms are:
A. saturated B. made of glycerol plus two fatty acids C. liquids at room temperature D. solid at room temperature E. generally found in animal fats